Yes that makes perfect sense!

So it all starts fitting together. The MAP is as you rightly say capable of measuring the boost with little inteference to the overall air flow itself, and so long as the map is set up correctly for the car, there is no reason why it should be changed.

The MAF by definition has to measure the flow of air and as such may in themselves reduce the VE!

Cool - I understood that in record time!

Right lets turn to fuelling.

In a different thread, I questioned why some cars need larger fuel injectors than other. for example, my 550cc injectors on my cossie more than adequately flow enough fuel for any power that I am currently running - ie about 400bhp ideally.

However, if you wanted to achieve that kind of power in other cars, then you would need larger injector sizes to get the same power. As I understand it, this relates to the pressure of the fuel rail. It kinda boils down to the same thing as the VE v Boost - it is a measure of how much flow against maximum size??

Given the above, I note that in cosworth land, people rarely change the fuel pressure. I wonder why this is - is it because ford just got it right - and if so, why is the jap world different?

JJ